cover 1933-34 Postage due covers (3), consisting of covers from Dar-es-Salaam to the Belgian Congo and returned, from Mwanza to Dar-es-Salaam and from England to Dar-es-Salaam, bearing respectively Kenya and Uganda 1928-33 30c., 40c. and 1/- each with either Dar-es-Salaam Poste Restante or Dar-es-Salaam c.d.s.; also 1933 Postal Notice relating to the use of these Postage Due stamps; a very scarce trio